FujiNet for Tandy CoCo Rev000

Original price was: $89.00.Current price is: $69.00.

The CoCoFuji is part of the FujiNet family and is designed to work with Tandy Color Computer models 1, 2, and 3. This FujiNet plugs into the CoCo’s cartridge port and uses a pigtail to connect to the serial port. Communication is handled through the Drivewire protocol.

Please keep in mind that the CoCoFuji is in Rev000. That means this item is in “pre-release”. While it is considered ready to use, there may be changes to both hardware and firmware before Rev 1 is released.

The CoCoFuji comes fully assembled and tested. Our cartridges are built using the specifications provided on GitHub as of June 15, 2024. We use a re-writeable EEPROM so the ROM can be updated. The serial cable is 457mm (18”), which allows it to reach the serial port on any CoCo model.

Developer’s Sale
In order to encourage more development, we’ve temporarily lowered the price!
Must purchase a CoCoFuji on backorder to receive the sale price.
Waitlist signups will not qualify for the sale price.
Sale ends July 15th, 2024

We are currently working on a small batch of CoCoFujis. We hope to ship the first units by July 15th.

Available on backorder

You may purchase this on backorder, or request an email when it is back in stock:

SKU: fujiNet-CoCo Category:


About Rev000

Rev000 does away with the tape circuit and moves to a ROM for bootstrapping HDB-DOS, similar to a “minimal” Rev00 build and bootstrapping via a CocoSDC or other ROM cart. Since it is now a cartridge format, you no longer need to power the ESP32 via USB, and instead it will normally take 5V from the cartridge port. There is a diode so if you do want to power by USB for debug logging or other reasons it is safe to do so without backfeeding into the Coco.

We build the CoCoFuji using the ESP32-DEVKITC-VIE and an external antenna (The antenna is external to the PCB, but still fits within the cartridge.)

About Firmware and ROM

The ESP32 runs FujiNet Firmware. In addition, a ROM provides HDB-DOS Drivewire 3.

The DIP switch allows you to select one of four 16K ROM images  from the EEPROM. The ROM contains  pre-compiled images for Coco 1, 2, and 3 of hdbdos-snapshot20190324 as well as a diagnostics ROM from the Color Computer Archive.

ROM Baud SW1-1 (A14) SW1-2 (A15)
hdbdw3cc1.rom (CoCo 1) 38,400 ON ON
hdbdw3cc2.rom (CoCo 2) 57,600 OFF ON
hdbdw3cc3.rom (CoCo 3) 115,200 ON OFF
Diagnostics v2.0 (1982) (26-3019) (Tandy) N/A OFF OFF

We build our CoCoFuji’s with the recommended bodge wires between the A14/A15 dip switch and pins 3/4 on the ESP32.
This allows the switch positions to be detected at startup and the correct baud rate set based on the ROM table above.

Note: ​The 3D printed parts used in FujiNet are not like injection molded parts. I strive to produce good quality prints but some may show extrusion rings, artifacts, blemishes and other signs of plastic extrusion.

*Sale ends July 15th.

Additional information

Weight 8 oz
Dimensions 6 × 6 × 3 in
Choose your serial cable length

300mm (11.8"), 457mm(18")


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